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Which Fertigator and questions

Well, I am back again. I am (again) looking into fertigation. As per my last post, I have approx 44k sq'. pumping from the lake with an anti siphon valve at intake. Looking for some examples of what to use for system, where to buy, etc. I live in MN, so I have winterization and Phosphate free chemicals to consider. I am pretty much irrigating turf with some flowers that are in the way.

Which system would be recommended.
Which fertilizer is recommended.

Besides cost of system, what would be my annual or monthly costs.

Is this something that is "ON" all of the time?
Or do you run a treatment once a month?, spring,fall?, spring,mid summer and fall?

Rite now we are amidst a pretty (OK really) dry summer and am watering 9 zones approx 20-25 GPM 1 hr every 2 days. (odd zones 1 day and even zones other day)